AMA CPT® Assistant - 1993 Issue 4 (April)
Modifiers -21, -25, -57, -58 (Winter 1993)
Winter 1993 page 26-end Coding Clarification Modifiers -21, -25, -57, -58 Modifiers -21, and -25 were revised in CPT 1994. Modifiers -57 and -58 were added to CPT 1994. Modifier -21 -21 Prolonged Evaluation and Management Service: When the face-to-face or floor/unit service(s) provided is prolonged or otherwise greater than that usually required for the highest level of evaluation and management service within a given category, it may be identified by adding modifier "-21" to the evaluation and management code number or by use of the separate five digit modifier code 09921. A report may also be appropriate. Modifier -21...
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